So there's still NTR in yuri fluff mangas huh? Fuck that
There almost certainly won't be any romantic liaisons with the new character. Its just that jealousy gets used as shorthand for growing feelings all the time even in fluffy stories.
Personally not a fan. IMO too many of them go "oh you're jealous that means you like her" and leave it at that without any elaboration or nuance. fuck that
Hopefully this one handles it well
Edit: seems like it did, more or less.